<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>检测是否是数字，包括整数，小数</title>
</head>
<body>
    <script>

const reg = /(\d|^[0-9]\.[0-9]+)/;
const isvalid = reg.test("s")
console.log(isvalid)
    </script>
</body>
</html>